12845681 has 2 divisors, whose sum is σ = 12845682. Its totient is φ = 12845680.

The previous prime is 12845647. The next prime is 12845683. The reversal of 12845681 is 18654821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12845056 + 625 = 3584^2 + 25^2 .

It is an emirp because it is prime and its reverse (18654821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12845681 is a prime.

It is a super-2 number, since 2×12845681² = 330023040707522, which contains 22 as substring.

Together with 12845683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12845683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6422840 + 6422841.

It is an arithmetic number, because the mean of its divisors is an integer number (6422841).

Almost surely, 2^12845681 is an apocalyptic number.

It is an amenable number.

12845681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12845681 is an equidigital number, since it uses as much as digits as its factorization.

12845681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 35.

The square root of 12845681 is about 3584.0871920197. The cubic root of 12845681 is about 234.1993637863.

The spelling of 12845681 in words is "twelve million, eight hundred forty-five thousand, six hundred eighty-one".